gettext: gfc-internal-format

 
 15.3.26 GFC internal Format Strings
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    These format strings are used inside the GNU Fortran Compiler
 sources, that is, the Fortran frontend in the GCC sources.  In such a
 format string, a directive starts with ‘%’ and is finished by a
 specifier: ‘%’ denotes a literal percent sign, ‘C’ denotes the current
 source location, ‘L’ denotes a source location, ‘c’ denotes a character,
 ‘s’ denotes a string, ‘i’ and ‘d’ denote an integer, ‘u’ denotes an
 unsigned integer.  ‘i’, ‘d’, and ‘u’ may be preceded by a size specifier
 ‘l’.